Signal receiving mechanism

Abstract

A signal receiving mechanism includes a cord reel, a cord wound around the cord reel, a signal receiving element assembled to a top of the cord reel, a grounding unit, and a pivot unit for rotatably connecting the cord reel to the grounding unit. The cord reel includes a hollow tubular body having a horizontal inner annular section. The cord includes a first and a second wire, inner ends of which are extended into the hollow tubular body below the inner annular section. The signal receiving element has a lower end downward extended through the inner annular section to electrically connect to the first wire of the cord. The grounding unit includes a first annular conductive plate, which is set at an underside of the inner annular section to electrically connect to the second wire of the cord, and is in contact with a conduction module for grounding.

1. A signal receiving mechanism, comprising:
 a cord reel including an axially extended hollow tubular body and an inner annular section horizontally located around an inner wall surface of said hollow tubular body; said hollow tubular body being provided on a wall thereof lower than said inner annular section with a horizontally extended through opening, and said inner annular section being formed at a predetermined position with a passage that vertically extends through the inner annular section; 
 a cord including a first wire and a second wire that are different in an electric polarity thereof, and at least part of said cord being wound around said hollow tubular body with an inner end of said cord extended through said through opening on said cord reel into a space of said cord reel below said inner annular section; 
 a signal receiving element being assembled to said hollow tubular body of said cord reel to locate in a space above said inner annular section; a lower end of said signal receiving element being downward extended through said passage on said inner annular section into the space of said cord reel below said inner annular section, so as to electrically connect to said first wire at the inner end of said cord; 
 a grounding unit including a first annular conductive plate and a conduction module that are in contact with each other; said first annular conductive plate being set at an underside of said inner annular section of said cord reel to electrically connect to said second wire at the inner end of said cord; and 
 a pivot unit for rotatably connecting said cord reel to said grounding unit, such that said first annular conductive plate along with said cord reel and said cord may be rotated relative to said conduction module at the same time. 
 
   
   
     2. The signal receiving mechanism as claimed in  claim 1 , wherein said signal receiving element includes a signal receiving section, a setting section outward extended from a lower end of said signal receiving section, and a contact section extended from an outer end of said setting section to form the lower end of said signal receiving element; said setting section being fixedly set in a space defined in said cord reel above said inner annular section, and said contact section being downward extended through said passage on said inner annular section to electrically connect to said first wire at the inner end of said cord. 
   
   
     3. The signal receiving mechanism as claimed in  claim 1 , further comprising a top unit; and wherein said signal receiving element includes a locating section, a setting section, a coiled signal receiving section extended between said locating section and said setting section, and a contact section extended from said setting section to locate opposite to said signal receiving section to form the lower end of said signal receiving element; said setting section being fixedly set in a space defined in said cord reel above said inner annular section, and said contact section being downward extended through said passage on said inner annular section to electrically connect to said first wire at the inner end of said cord; and wherein said hollow tubular body includes at least one retaining hole formed on an inner wall surface thereof above said inner annular section; and wherein said top unit is connected at a predetermined point to an upper end of said locating section of said signal receiving element, so that said signal receiving section of said signal receiving element is sandwiched between said top unit and said cord reel; and wherein said top unit includes at least one retaining catch being detachably hooked to said at least one retaining hole on said hollow tubular body by interference fit. 
   
   
     4. The signal receiving mechanism as claimed in  claim 1 , wherein said signal receiving element is a coil spring. 
   
   
     5. The signal receiving mechanism as claimed in  claim 2 , wherein said hollow tubular body is provided on an inner wall surface above said inner annular section with at least one protrusion, and said setting section of said signal receiving element is fixedly set in a space defined between said at least one protrusion and said inner annular section. 
   
   
     6. The signal receiving mechanism as claimed in  claim 3 , wherein said hollow tubular body is provided on an inner wall surface above said inner annular section with at least one protrusion, and said setting section of said signal receiving element is fixedly set in a space defined between said at least one protrusion and said inner annular section. 
   
   
     7. The signal receiving mechanism as claimed in  claim 1 , wherein said inner annular section is formed at the underside with an annular rabbet, and said first annular conductive plate being set in said annular rabbet. 
   
   
     8. The signal receiving mechanism as claimed in  claim 3 , wherein said inner annular section is formed at the underside with an annular rabbet, and said first annular conductive plate being set in said annular rabbet. 
   
   
     9. The signal receiving mechanism as claimed in  claim 1 , wherein said conduction module includes an upper annular limiting wall that is in contact with said first annular conductive plate, a lower annular limiting wall for grounding, and an elastic element located between said upper and said lower annular limiting wall. 
   
   
     10. The signal receiving mechanism as claimed in  claim 3 , wherein said conduction module includes an upper annular limiting wall that is in contact with said first annular conductive plate, a lower annular limiting wall for grounding, and an elastic element located between said upper and said lower annular limiting wall. 
   
   
     11. The signal receiving mechanism as claimed in  claim 1 , wherein said cord reel further includes two outer annular sections separately horizontally located around an upper and a lower outer wall surface of said hollow tubular body to space from each other. 
   
   
     12. The signal receiving mechanism as claimed in  claim 3 , wherein said cord reel further includes two outer annular sections separately horizontally located around an upper and a lower outer wall surface of said hollow tubular body to space from each other. 
   
   
     13. The signal receiving mechanism as claimed in  claim 11 , further comprising a hollow base located around said cord reel, so that said cord reel and said hollow base together define a cord winding space therebetween; said hollow base being provided on a peripheral wall thereof between said two outer annular sections of said cord reel with a cord passage to communicate said cord winding space with external environment for said cord to extend therethrough. 
   
   
     14. The signal receiving mechanism as claimed in  claim 12 , further comprising a hollow base located around said cord reel, so that said cord reel and said hollow base together define a cord winding space therebetween; said hollow base being provided on a peripheral wall thereof between said two outer annular sections of said cord reel with a cord passage to communicate said cord winding space with external environment for said cord to extend therethrough. 
   
   
     15. The signal receiving mechanism as claimed in  claim 13 , wherein said grounding unit further includes a second annular conductive plate that is located below said hollow base to connect to said pivot unit for grounding; and wherein said conduction module includes an upper annular limiting wall that is in contact with said first annular conductive plate, a lower annular limiting wall that is in contact with said second annular conductive plate, and an elastic element located between said upper and said lower annular limiting wall to normally push against said upper and lower annular limiting walls, so that said upper and said lower annular limiting wall are in effective contact with said first and said second annular conductive plate, respectively. 
   
   
     16. The signal receiving mechanism as claimed in  claim 14 , wherein said grounding unit further includes a second annular conductive plate that is located below said hollow base to connect to said pivot unit for grounding; and wherein said conduction module includes an upper annular limiting wall that is in contact with said first annular conductive plate, a lower annular limiting wall that is in contact with said second annular conductive plate, and an elastic element located between said upper and said lower annular limiting wall to normally push against said upper and lower annular limiting walls, so that said upper and said lower annular limiting wall are in effective contact with said first and said second annular conductive plate, respectively. 
   
   
     17. The signal receiving mechanism as claimed in  claim 15 , wherein said grounding unit further includes a seat located below said second annular conductive plate. 
   
   
     18. The signal receiving mechanism as claimed in  claim 16 , wherein said grounding unit further includes a seat located below said second annular conductive plate. 
   
   
     19. The signal receiving mechanism as claimed in  claim 17 , wherein said seat is a magnetic seat. 
   
   
     20. The signal receiving mechanism as claimed in  claim 18 , wherein said seat is a magnetic seat.